I reading programming perl, at chapter 12, the objects, has following documents :

The next::method has a similar problems because it uses the package of its
caller to figure out what class to look at. If you define a method in Donkey from
another package, next::method will break:

package main;
*Donkey::sound = sub { (shift)–>next::method(@_) };

[download]

The anonymous subroutine shows up in the stack with as _ _ANON_ _, so next::method doesn’t know which package it is in. You can use the Sub::Name CPAN module to make it work out, though: 

use Sub::Name qw(subname);
*Donkey::sound =
subname 'Donkey::sound' => sub { (shift)–>next::method(@_) };

[download]

I am very inquisitive how Sub::Name module complete this work ? let the anonymous subroutine's caller not be __ANON__

very thanks your help :)

In reply to how Sub::Name set anonymous subroutine 's caller to NOT __ANON__ ? by chinaxing

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.